Abstract
Addition of 100 μM choline chloride to the medium increased (by approx. 36%) both the length of the hyphal growth unit (G a measure of mycelial branching) and the mean hyphal extension rate (E) of Fusarium graminearum but did not increase the maximum rate of extension of the hyphae (Emax). The paramorphogen, edifenphos (Hinosan) reduced G and E without affecting specific growth rate (μ). However, when mycelia were treated with edifenphos plus choline, μ was reduced, G was increased by approx. 35%, but E and Emax were not affected. The results suggest that the primary effect of edifenphos is inhibition of hyphal extension, whilst the primary effect of choline is inhibition of branch initiation.
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